Audio-frequency transformer



May 5, 1925. 1,536,451

\ E. B. NOWOSIELSK] AUDIO FREQUENCY TRANSFORMER Filed A ug 22, 1924INVENTOR [DWI/Q7 5. A/dM/OS/ELSK/ A TTORNE Y Ill;

Patented May 5, 1925.

outrun sures PATENT OFFICE.

EDWARD B. NOWOSIELSKI, 0F BLOOMFIELD, NEW JERSEY, ASSIGNOR T0 SPLITDORFELECTRICAL COMPANY, OF NEWARK, NEW JERSEY.

AUDIO-FREQUEN CY TRANSFORMER.

Application filed August 22, 1924. Serial No. 733,478.

To aZZ whom it may concern:

Be itknown that I, EDWARD B. NOWOSIEL- SKI, acitizen of the UnitedStates, residing at Bloomfield, in the county of Essex, State of NewJersey, have invented certain new and. useful Improvements inAudio-Frequency 'Iransformers, of which the following is a description,reference being had to the accompanying drawing andto the figures ofreference marked thereon.

This invention relates to an audio frequency transformer especiallyadapted for use in connection with radio circuits.

It is the object of this invention to provide an audio frequencytransformer which will transform the audio frequency currents withminimum distortion.

Another object of my invention is to provide a transformer which is neatin appearance, simple in construction, and hence, cheap to manufacture.

Other objects will be apparent after a study of the drawing taken inconnection with the annexed specification, wherein Figure 1 is a sideview of my complete transformer.

Figure 2 is an end view of Fig. 1 while Figure 3 is a bottom view of thetransformer.

In the following description the same numbers refer to correspondingparts in the various views.

The transformer as illustrated is of the usual type made up oflaminations in which the larger one designated by the numeral 1 issubstantially E shape with a straight or I shape lamination to completethe magnetic circuit. The laminations 1 are provided'with a projection3, on either end. These projections serve to increase the area ofcontact with lamination 2 at the same time theyiact as a means forclamping the laminations 1 and 2 together through the medium of clamps 4that pass through the bottom frame member 5. The ends 6 of the clamps 4.ar bent over as indicated in Fig. 3, thereby drawing the clamps securelyinto locking position. In addition to the clamps the cover member 7 hasprojections 8 on either end which also extend through the bottom framemember 5 and are bent over as indicated at 9. The cover member 7 is usedto hold the laminations 1 in place and to act as a cover to present amore finished appearance of the complete transformer.

Frame member 5 has a portion 15 punched upward into clamp members 10which engage both sides of the I shaped laminations he primary andsecondary windings are included in a coil 11 associated with which is aconnecting board 12 having tenninals 13 arranged on either side, two forthe primary and two for the secondary; holes 14 are used on frame member5 for mounting the transformer. lVhile I have shown the connecting board12 between the coil and part of the core structure, it is to beunderstood that this connecting board may be mounted on the outside ofthe core in a satisfactory manner.

Other changes in details may be made without departing from th spirit ofmy invention and the scope of the appended claims.

Having thus described my invention, what Iclaim is:

1. In a transformer, a core having windings associated therewith, saidcore having substantially E shaped laminations with projecting ends, barlaminations closing the E, a frame member adjacent the bar laminationsand clamps passing over the projecting ends of the E shaped laminationsand having parts passing through said frame member and fastened thereto.

2. In a transformer, a core having substantially E shaped laminationswith projecting ends, bar laminations closing the E and extendingsubstantially to the end of said projecting ends, a frame memberadjacent the bar laminations, and clamps engaging said projecting endsof the E shaped laminations and having parts passlng through said framemember.

3. In a transformer, a core having windings associated therewith, saidcore having substantially E shaped laminations with projecting ends, barlaminations closing the E, a frame member adjacent the bar laminationsand having parts extending upward on the outside of sand bar laminationsand in close contact therewith, and clamps engaging the projecting endsof the E shaped laminations and. having part-s fastened through saidframe member.

4. In a transformer, a core having windings associated therewith, saidcore having substantially E shaped laminations with projecting ends, barlaminations closing the E, a frame member adjacent the bottom of the barlaminations, acover member passing over the outer surface of the Elaminations and clamps engaging said cover and projecting ends of the Eshaped laminations and having parts fastened through said frame members.

5. In a transformer, a core having windings associated'therewith, saidcore having substantially E shaped laminations with projecting ends, barlaminations closing the E, a frame member adjacent the bar laminations,and having parts engaging the outer sides of said group of barlaminations, a cover engaging the outer surface of said E shapedlaminations, and clamps engagin said cover and projecting ends of theshaped laminations and having parts passing through and fastened to saidframe member.

6. In an audio transformer, a shell type core, windings carried on anarm of the core, said core comprising; E and bar shaped laminations withmeans for increasing the effectiveness of the magnetic joint at thejunction of the E and bar laminations comjecting ends and barlaminations securely I together. 7

7. Inan audio transformer, a shell type.

core having E and bar shaped laminations, windings carried on thecentral arm of the E part of the core, said E laminations havingportions projecting away from the windings, said bar laminationsextending to substantially the end of said projecting portions of the Elaminations; a frame member having guide and support portions engagingthe opposite sides of'said'group of bar laminations and a cover passingover the E shaped'laminations including said projecting ends and clampspassing over both cover and.projecting ends and having parts fastened tosaid frame member.

In' testimony whereof, I affix my signature.

EDWARD B. NOWOSIELSKI.

